Percent of Change
What does it mean when a price increases and decreases?
Increase means the price or amount goes up
Decrease means the price or amount goes down
Do you add or subtract sales tax to the price of the item you are buying?
Add!
How do you set up this problem?
Ken spent $23.50 on lunch, but wanted to leave a 15% tip.
T/23.50=15/100
How would you set up this problem?
Mike wanted to buy shoes that were $85 but they were on sale for 45% off.
d/85=45/100
What is the formula for simple interest?
I= P x R x T
Find the percent of change!
2ft to 5ft
Does in increase or decrease?
150%, increase
How would you set up this problem?
I spent $50 on dinner and sales tax was 17%
T/50 = 17/100
Find the total cost to the nearest cent!
My family spent $82.50 on dinner and we left a 18% tip. How much did we spend in total?
$97.35
What step is different when finding the discount than finding sales tax or markup?
You subtract instead of add!
What do the letters stand for in this formula?
I= P x R x T
I= Interest
P= Principal/money you start with
R= Rate/ Divide your percent by 100 to create a decimal
T= Time/years
Find the percent of change!
18 inches to 7 inches
Does it increase or decrease?
61%, decrease
Find the total cost and round to the nearest cent!
Lisa spent $56.00 on a pair of new jeans, the sales tax was 8%. How much did she spend it total?
$60.48
Find the total cost to the nearest cent!
The manager at Eddy's Electronics bought tv's for $195, he wanted to mark them up 215%. How much would they sell the tv for?
$614.25
Find the sale price
Jan wanted to buy a sweater that cost $70 but it was on sale for 30% off. How much did Jan pay for the sweater?
$49.00
Find how much interest I earned!
I started with $550 in my savings account. I earned 3.5% interest each year. How much interest would I earn in 6 years?
$115.50
Find the percent of change!
It takes June 12 minutes to run the mile. After some practice the next time she ran it, it only took her 7 minutes. How much percent did she decrease her time by?
Round to the nearest percent!
42%
Find the total cost to the nearest cent!
Carol bought a new tv for $220 but sales tax was 5%. So how much did she spend in total?
$231
Find the total cost to the nearest cent!
Josh and Mary went out to dinner. It cost $60 but they wanted to tip 16%. How much was their total bill?
$69.60
Find the sale price
Jim wanted to buy a new guitar that cost $565. It was on sale for 55% off. How much did he pay?
$254.25
Find how much interest I earned!
I started with $345 in my savings account. I earned 6% interest per year. How much interest would I earn after 8 years?
$165.60
The online price for a car was $5,500, but at the car dealership they were having a sale. The car was priced at $3,300 dollars in person. What is the percent of change? Did it increase or decrease?
40% decrease
Find the total cost to the nearest cent!
Jack wants to buy a new video game that costs $75.00. The sales tax is 6.5%. what is the total cost of the video game?
$79.88
Find the total cost ,round to the nearest cent!
A jewelry store buys necklaces at a whole sale cost of $200, the owner wants to mark them up 115%. What is the total cost going to be?
$430.00
Find the sale price!
Josh wanted to buy a new phone that cost $1,500 but it was on sale for 45% off. How much did he pay for the phone?
$825.00
Find how much interest I earned AND my total balance!
I started with $763 in my savings account. I earned 2.3% interest every year. How much interest did I earn after 5 years? What is my total balance?
$87.75
$850.75